Jupiter's moons in September 2026
Io · Europa · Ganymede · Callisto — eclipses, occultations, transits, shadows, and 43 mutual events
Jupiter's four big moons put on a show every night: they slip behind the planet and into its shadow, cross its face, and drag their shadows across the cloud tops. Any telescope shows it. This is a mutual-event season — every six years the moons' orbits turn edge-on to the Sun and they eclipse and occult each other. Times are for the whole Earth; pick a location and the list keeps only what your sky shows.
| When (UTC) | Event | Jupiter in your sky |
|---|---|---|
| Sep 1 03:07 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 1 05:58 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 1 13:06 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Sep 1 17:06 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Sep 1 19:23 UTC | Callisto's shadow enters the disc | — |
| Sep 1 19:26 UTC | Callisto's shadow leaves the disc | — |
| Sep 1 19:28 UTC | Callisto's shadow enters the disctakes 10 min | — |
| Sep 1 20:34 UTC | Io eclipses Europa3.2 min · 21% of Europa covered · drops ≈0.2 mag | — |
| Sep 1 21:23 UTC | Io occults Europa4.0 min · 50% of Europa covered · drops ≈0.3 mag | — |
| Sep 2 00:10 UTC | Callisto's shadow leaves the disctakes 10 min | — |
| Sep 2 00:28 UTC | Io's shadow enters the disctakes 5 min | — |
| Sep 2 00:37 UTC | Callisto begins its transit across the disctakes 10 min | — |
| Sep 2 01:01 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 2 02:46 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 2 03:20 UTC | Io's transit endstakes 4 min | — |
| Sep 2 05:26 UTC | Callisto's transit endstakes 10 min | — |
| Sep 2 21:36 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 3 00:28 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 3 03:17 UTC | Europa eclipses Io1.9 min · 4% of Io covered · drops ≈0.0 mag | — |
| Sep 3 04:07 UTC | Europa occults Io4.0 min · 34% of Io covered · drops ≈0.2 mag | — |
| Sep 3 07:15 UTC | Europa's shadow enters the disctakes 7 min | — |
| Sep 3 08:24 UTC | Europa begins its transit across the disctakes 4 min | — |
| Sep 3 10:09 UTC | Europa's shadow leaves the disctakes 3 min | — |
| Sep 3 11:18 UTC | Europa's transit endstakes 4 min | — |
| Sep 3 18:56 UTC | Io's shadow enters the disctakes 7 min | — |
| Sep 3 19:32 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 3 21:15 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 3 21:50 UTC | Io's transit endstakes 4 min | — |
| Sep 4 03:30 UTC | Ganymede disappears into Jupiter's shadowtakes 8 min | — |
| Sep 4 09:32 UTC | Ganymede reappears from behind Jupitertakes 8 min | — |
| Sep 4 16:04 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 4 18:58 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 5 02:24 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Sep 5 06:30 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Sep 5 09:41 UTC | Io eclipses Europa3.3 min · 17% of Europa covered · drops ≈0.2 mag | — |
| Sep 5 10:35 UTC | Io occults Europa4.1 min · 49% of Europa covered · drops ≈0.3 mag | — |
| Sep 5 13:25 UTC | Io's shadow enters the disctakes 5 min | — |
| Sep 5 14:02 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 5 15:43 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 5 16:20 UTC | Io's transit endstakes 4 min | — |
| Sep 6 10:33 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 6 13:28 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 6 16:23 UTC | Europa eclipses Io2.6 min · 3% of Io covered · drops ≈0.0 mag | — |
| Sep 6 17:18 UTC | Europa occults Io4.3 min · 38% of Io covered · drops ≈0.3 mag | — |
| Sep 6 20:32 UTC | Europa's shadow enters the disctakes 7 min | — |
| Sep 6 21:48 UTC | Europa begins its transit across the disctakes 4 min | — |
| Sep 6 23:26 UTC | Europa's shadow leaves the disctakes 3 min | — |
| Sep 7 00:42 UTC | Europa's transit endstakes 4 min | — |
| Sep 7 07:53 UTC | Io's shadow enters the disctakes 5 min | — |
| Sep 7 08:32 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 7 10:12 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 7 10:50 UTC | Io's transit endstakes 4 min | — |
| Sep 7 17:38 UTC | Ganymede's shadow enters the disctakes 13 min | — |
| Sep 7 20:14 UTC | Ganymede begins its transit across the disctakes 8 min | — |
| Sep 7 21:16 UTC | Ganymede's shadow leaves the disctakes 7 min | — |
| Sep 7 23:52 UTC | Ganymede's transit endstakes 8 min | — |
| Sep 8 05:01 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 8 07:58 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 8 15:41 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Sep 8 19:54 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Sep 8 22:47 UTC | Io eclipses Europa3.5 min · 30% of Europa covered · drops ≈0.4 mag | — |
| Sep 8 23:46 UTC | Io occults Europa4.2 min · 71% of Europa covered · drops ≈0.4 mag | — |
| Sep 9 02:22 UTC | Io's shadow enters the disctakes 5 min | — |
| Sep 9 02:31 UTC | Ganymede occults Callisto8.9 min · 16% of Callisto covered · drops ≈0.1 mag | — |
| Sep 9 03:02 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 9 04:40 UTC | Io's shadow leaves the disctakes 4 min | — |
| Sep 9 05:20 UTC | Io's transit endstakes 4 min | — |
| Sep 9 23:30 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 10 02:28 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 10 02:47 UTC | Callisto disappears into Jupiter's shadowtakes 10 min | — |
| Sep 10 05:30 UTC | Europa eclipses Io3.1 min · 15% of Io covered · drops ≈0.2 mag | — |
| Sep 10 06:30 UTC | Europa occults Io4.5 min · 46% of Io covered · drops ≈0.3 mag | — |
| Sep 10 07:31 UTC | Callisto reappears from Jupiter's shadowtakes 10 min | — |
| Sep 10 09:13 UTC | Callisto disappears behind Jupitertakes 10 min | — |
| Sep 10 09:52 UTC | Europa's shadow enters the disctakes 3 min | — |
| Sep 10 11:12 UTC | Europa begins its transit across the disctakes 4 min | — |
| Sep 10 12:19 UTC | Europa occults Callisto1.8 min · 0% of Callisto covered · drops ≈0.0 mag | — |
| Sep 10 12:44 UTC | Europa's shadow leaves the disctakes 3 min | — |
| Sep 10 14:06 UTC | Europa's transit endstakes 4 min | — |
| Sep 10 14:08 UTC | Callisto reappears from behind Jupitertakes 10 min | — |
| Sep 10 20:50 UTC | Io's shadow enters the disctakes 7 min | — |
| Sep 10 21:32 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 10 23:08 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 10 23:50 UTC | Io's transit endstakes 4 min | — |
| Sep 11 07:29 UTC | Ganymede disappears into Jupiter's shadowtakes 8 min | — |
| Sep 11 13:56 UTC | Ganymede reappears from behind Jupitertakes 8 min | — |
| Sep 11 17:58 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 11 20:58 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 12 04:59 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Sep 12 09:17 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Sep 12 11:54 UTC | Io eclipses Europa3.6 min · 35% of Europa covered · drops ≈0.5 mag | — |
| Sep 12 12:57 UTC | Io occults Europa4.2 min · 93% of Europa covered · drops ≈0.6 mag | — |
| Sep 12 15:19 UTC | Io's shadow enters the disctakes 5 min | — |
| Sep 12 16:02 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 12 17:37 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 12 18:20 UTC | Io's transit endstakes 4 min | — |
| Sep 13 12:26 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 13 15:28 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 13 18:36 UTC | Europa eclipses Io3.5 min · 17% of Io covered · drops ≈0.2 mag | — |
| Sep 13 19:42 UTC | Europa occults Io4.6 min · 54% of Io covered · drops ≈0.4 mag | — |
| Sep 13 23:07 UTC | Europa's shadow enters the disctakes 5 min | — |
| Sep 14 00:36 UTC | Europa begins its transit across the disctakes 4 min | — |
| Sep 14 02:02 UTC | Europa's shadow leaves the disctakes 3 min | — |
| Sep 14 03:30 UTC | Europa's transit endstakes 4 min | — |
| Sep 14 09:47 UTC | Io's shadow enters the disctakes 5 min | — |
| Sep 14 10:31 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 14 12:05 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 14 12:49 UTC | Io's transit endstakes 4 min | — |
| Sep 14 21:37 UTC | Ganymede's shadow enters the disc | — |
| Sep 14 21:41 UTC | Ganymede's shadow leaves the disc | — |
| Sep 14 21:42 UTC | Ganymede's shadow enters the disctakes 8 min | — |
| Sep 15 00:38 UTC | Ganymede begins its transit across the disctakes 8 min | — |
| Sep 15 01:15 UTC | Ganymede's shadow leaves the disctakes 7 min | — |
| Sep 15 04:16 UTC | Ganymede's transit endstakes 8 min | — |
| Sep 15 06:55 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 15 09:58 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 15 12:45 UTC | Ganymede occults Europa3.8 min · 15% of Europa covered · drops ≈0.1 mag | — |
| Sep 15 18:16 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Sep 15 22:41 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Sep 16 01:01 UTC | Io eclipses Europa3.7 min · 27% of Europa covered · drops ≈0.3 mag | — |
| Sep 16 02:08 UTC | Io occults Europa4.1 min · 71% of Europa covered · drops ≈0.4 mag | — |
| Sep 16 04:18 UTC | Io's shadow enters the disctakes 3 min | — |
| Sep 16 05:01 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 16 06:34 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 16 07:19 UTC | Io's transit endstakes 4 min | — |
| Sep 17 01:23 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 17 04:28 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 17 07:43 UTC | Europa eclipses Io3.9 min · 30% of Io covered · drops ≈0.4 mag | — |
| Sep 17 08:54 UTC | Europa occults Io4.5 min · 51% of Io covered · drops ≈0.4 mag | — |
| Sep 17 12:24 UTC | Europa's shadow enters the disctakes 5 min | — |
| Sep 17 13:59 UTC | Europa begins its transit across the disctakes 4 min | — |
| Sep 17 15:19 UTC | Europa's shadow leaves the disctakes 3 min | — |
| Sep 17 16:53 UTC | Europa's transit endstakes 4 min | — |
| Sep 17 22:44 UTC | Io's shadow enters the disctakes 8 min | — |
| Sep 17 23:31 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 18 01:02 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 18 01:49 UTC | Io's transit endstakes 4 min | — |
| Sep 18 11:27 UTC | Ganymede disappears into Jupiter's shadowtakes 8 min | — |
| Sep 18 13:21 UTC | Callisto's shadow enters the disctakes 16 min | — |
| Sep 18 18:10 UTC | Callisto's shadow leaves the disctakes 10 min | — |
| Sep 18 18:19 UTC | Ganymede reappears from behind Jupitertakes 8 min | — |
| Sep 18 19:52 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 18 20:52 UTC | Callisto begins its transit across the disctakes 10 min | — |
| Sep 18 22:58 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 19 01:43 UTC | Callisto's transit endstakes 10 min | — |
| Sep 19 06:21 UTC | Callisto occults Europa6.0 min · 82% of Europa covered · drops ≈0.7 mag | — |
| Sep 19 07:33 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Sep 19 12:04 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Sep 19 14:07 UTC | Io eclipses Europa3.8 min · 49% of Europa covered · drops ≈0.7 mag | — |
| Sep 19 15:19 UTC | Io occults Europa3.9 min · 45% of Europa covered · drops ≈0.2 mag | — |
| Sep 19 17:12 UTC | Io's shadow enters the disctakes 5 min | — |
| Sep 19 18:01 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 19 19:31 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 19 20:19 UTC | Io's transit endstakes 4 min | — |
| Sep 20 14:20 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 20 17:28 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 20 20:50 UTC | Europa eclipses Io4.2 min · 27% of Io covered · drops ≈0.3 mag | — |
| Sep 20 22:05 UTC | Europa occults Io4.3 min · 37% of Io covered · drops ≈0.2 mag | — |
| Sep 21 01:42 UTC | Europa's shadow enters the disctakes 8 min | — |
| Sep 21 03:23 UTC | Europa begins its transit across the disctakes 4 min | — |
| Sep 21 04:37 UTC | Europa's shadow leaves the disctakes 3 min | — |
| Sep 21 06:17 UTC | Europa's transit endstakes 4 min | — |
| Sep 21 11:41 UTC | Io's shadow enters the disctakes 5 min | — |
| Sep 21 12:31 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 21 13:59 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 21 14:49 UTC | Io's transit endstakes 4 min | — |
| Sep 22 01:35 UTC | Ganymede's shadow enters the disc | — |
| Sep 22 01:39 UTC | Ganymede's shadow leaves the disc | — |
| Sep 22 01:40 UTC | Ganymede's shadow enters the disctakes 9 min | — |
| Sep 22 04:59 UTC | Ganymede begins its transit across the disctakes 8 min | — |
| Sep 22 05:14 UTC | Ganymede's shadow leaves the disctakes 7 min | — |
| Sep 22 08:38 UTC | Ganymede's transit endstakes 8 min | — |
| Sep 22 08:49 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 22 11:58 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 22 16:16 UTC | Ganymede occults Europa6.0 min · 69% of Europa covered · drops ≈0.3 mag | — |
| Sep 22 20:51 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Sep 23 01:26 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Sep 23 03:14 UTC | Io eclipses Europa3.8 min · 62% of Europa covered · drops ≈1.1 mag | — |
| Sep 23 04:29 UTC | Io occults Europa3.6 min · 44% of Europa covered · drops ≈0.2 mag | — |
| Sep 23 06:09 UTC | Io's shadow enters the disctakes 6 min | — |
| Sep 23 07:01 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 23 08:27 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 23 09:19 UTC | Io's transit endstakes 4 min | — |
| Sep 24 03:17 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 24 06:27 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 24 09:57 UTC | Europa eclipses Io4.4 min · 49% of Io covered · drops ≈0.7 mag | — |
| Sep 24 11:17 UTC | Europa occults Io3.8 min · 22% of Io covered · drops ≈0.1 mag | — |
| Sep 24 15:02 UTC | Europa's shadow enters the disctakes 6 min | — |
| Sep 24 16:45 UTC | Europa begins its transit across the disctakes 4 min | — |
| Sep 24 17:54 UTC | Europa's shadow leaves the disctakes 4 min | — |
| Sep 24 19:40 UTC | Europa's transit endstakes 4 min | — |
| Sep 25 00:40 UTC | Io's shadow enters the disctakes 6 min | — |
| Sep 25 01:30 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 25 02:56 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 25 03:48 UTC | Io's transit endstakes 4 min | — |
| Sep 25 06:35 UTC | Europa occults Ganymede5.0 min · 8% of Ganymede covered · drops ≈0.1 mag | — |
| Sep 25 15:25 UTC | Ganymede disappears into Jupiter's shadowtakes 8 min | — |
| Sep 25 21:45 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 25 22:40 UTC | Ganymede reappears from behind Jupitertakes 8 min | — |
| Sep 26 00:57 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 26 10:08 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Sep 26 14:49 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Sep 26 16:20 UTC | Io eclipses Europa3.9 min · 62% of Europa covered · drops ≈1.1 mag | — |
| Sep 26 17:40 UTC | Io occults Europa3.1 min · 28% of Europa covered · drops ≈0.1 mag | — |
| Sep 26 19:06 UTC | Io's shadow enters the disctakes 6 min | — |
| Sep 26 20:00 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 26 20:47 UTC | Callisto disappears into Jupiter's shadowtakes 10 min | — |
| Sep 26 21:24 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 26 22:18 UTC | Io's transit endstakes 4 min | — |
| Sep 27 00:39 UTC | Io occults Callisto5.9 min · 46% of Callisto covered · drops ≈0.2 mag | — |
| Sep 27 01:32 UTC | Callisto reappears from Jupiter's shadowtakes 10 min | — |
| Sep 27 05:24 UTC | Callisto disappears behind Jupitertakes 10 min | — |
| Sep 27 10:19 UTC | Callisto reappears from behind Jupitertakes 10 min | — |
| Sep 27 16:14 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 27 19:27 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 27 22:23 UTC | Europa occults Callisto7.0 min · 38% of Callisto covered · drops ≈0.2 mag | — |
| Sep 27 23:05 UTC | Europa eclipses Io4.6 min · 47% of Io covered · drops ≈0.7 mag | — |
| Sep 28 00:30 UTC | Europa occults Io3.1 min · 9% of Io covered · drops ≈0.1 mag | — |
| Sep 28 04:20 UTC | Europa's shadow enters the disctakes 6 min | — |
| Sep 28 06:09 UTC | Europa begins its transit across the disctakes 4 min | — |
| Sep 28 07:12 UTC | Europa's shadow leaves the disctakes 3 min | — |
| Sep 28 09:03 UTC | Europa's transit endstakes 4 min | — |
| Sep 28 13:34 UTC | Io's shadow enters the disctakes 6 min | — |
| Sep 28 14:30 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 28 15:52 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 28 16:48 UTC | Io's transit endstakes 4 min | — |
| Sep 29 05:34 UTC | Ganymede's shadow enters the disctakes 14 min | — |
| Sep 29 09:12 UTC | Ganymede's shadow leaves the disctakes 8 min | — |
| Sep 29 09:20 UTC | Ganymede begins its transit across the disctakes 8 min | — |
| Sep 29 10:42 UTC | Io disappears into Jupiter's shadowtakes 4 min | — |
| Sep 29 12:58 UTC | Ganymede's transit endstakes 8 min | — |
| Sep 29 13:57 UTC | Io reappears from behind Jupitertakes 4 min | — |
| Sep 29 19:45 UTC | Ganymede occults Europa6.2 min · 100% of Europa covered · drops ≈0.5 mag | — |
| Sep 29 23:25 UTC | Europa disappears into Jupiter's shadowtakes 4 min | — |
| Sep 30 04:11 UTC | Europa reappears from behind Jupitertakes 4 min | — |
| Sep 30 05:26 UTC | Io eclipses Europa4.0 min · 56% of Europa covered · drops ≈0.9 mag | — |
| Sep 30 06:50 UTC | Io occults Europa2.4 min · 10% of Europa covered · drops ≈0.1 mag | — |
| Sep 30 08:03 UTC | Io's shadow enters the disctakes 6 min | — |
| Sep 30 08:59 UTC | Io begins its transit across the disctakes 4 min | — |
| Sep 30 10:21 UTC | Io's shadow leaves the disctakes 3 min | — |
| Sep 30 11:17 UTC | Io's transit endstakes 4 min | — |
Reading the list
Each disappears / reappears line is the moment the moon's disc is fully in or first out; the "takes N min" is how long the disc takes to cross the edge. Halves that happen behind Jupiter or inside its shadow are left out, since nobody can see them. Positions are from JPL DE431 and the jup365 satellite ephemeris, Jupiter as an oblate spheroid with its shadow cone; mutual-event magnitude drops assume uniform discs and are estimates. Events are geocentric — the same instant everywhere on Earth to well under a second.